You can also take one frame and overlay it onto another as a transparency, letting you trace over your work.

你能选取一个结构然后覆盖它到另外的幻灯片上，让你自己描绘作品。

youdao

You can also take one frame and overlay it onto another as a transparency, letting you trace over your work.

你能选取一个结构然后覆盖它到另外的幻灯片上，让你自己描绘作品。

youdao